WorksheetsCh. 2 Chemical Basis of Life Part 1
Total questions: 18
Worksheet time: 10mins
A pure substance made of only one kind of atom is called an _________.
element.
compound.
mixture.
solution.
Fill in the blank: The smallest particle of an element is called an _________.
atom
molecule
cell
compound
Fill in the blank: The dense core of an atom, composed of protons and usually neutrons, is called the _________.
nucleus
electron cloud
valence shell
molecule
A subatomic particle that has a negative charge and encircles the nucleus of an atom is called an _________.
electron
proton
neutron
positron
Fill in the blank: A subatomic particle that has no charge and is found in the nucleus of an atom is called a _________.
neutron
proton
electron
positron
A subatomic particle that has a positive charge and is found in the nucleus of an atom is called a _________.
proton
electron
neutron
positron
Fill in the blank: Atoms of the same element that have different numbers of neutrons are called _________.
isotopes.
ions.
molecules.
compounds.
Fill in the blank: Positively and negatively charged atoms are called _________.
ions.
molecules.
atoms.
neutrons.
Fill in the blank: A chemical bond resulting from the attraction between oppositely charged ions is called an _________.
ionic bond.
covalent bond.
metallic bond.
hydrogen bond.
A chemical bond that involves sharing a pair of electrons between atoms in a molecule is called a _________.
covalent bond
ionic bond
hydrogen bond
metallic bond
A weak bond between a hydrogen atom and an atom of oxygen or nitrogen is called a _________.
hydrogen bond
ionic bond
covalent bond
metallic bond
A particle composed of two or more bonded atoms is called a _________.
molecule.
atom.
ion.
element.
Fill in the blank: A substance that increases the hydrogen ion concentration of a solution is called an _________.
acid
base
salt
solvent
A substance that decreases the hydrogen ion concentration in a solution is called a _________.
base.
acid.
salt.
solvent.
What is the definition of pH?
hydrogen ion concentration
potential of hydrogen
power of hydrogen
partial pressure of hydrogen
What is the definition of acidosis?
pH below 7.35
pH above 7.45
Normal pH level
pH exactly 7.0
What is the definition of alkalosis?
pH above 7.45
pH below 7.35
Normal pH level
pH exactly 7.0
Label the following item
